Abstract A survey of phreatophyte vegetation and its water usage was conducted for the North Platte Basin of Wyoming. The study was limited to the phreatophyte vegetation along the North Platte River and its three main tributaries: the Laramie, Medicine Bow, and Sweetwater Rivers.
An estimated 90 to 95% of the phreatophytes were either cottonwoods or willows. Long-term annual average evapotranspiration rates of .94, .81, and .67 m for high, medium, and low density vegetation, respectively, were estimated using the Blaney-Criddle method. The total estimated long-term annual evapotranspiration was 8,121 hectaremeters for the four major rivers in the North Platte Basin of Wyoming.
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